package com.itheima.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
//Servlet线程安全的问题
public class ServletDemo04 extends HttpServlet {
//    1.定义一个用户名的成员变量
    private String username;
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        String username=null;
        synchronized (this)
        {
            //2.获取用户名
            username = req.getParameter("username");
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //3.将用户名响应给浏览器
            PrintWriter pw=resp.getWriter();
            pw.println("welcome"+username);
            pw.close();
        }
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}
